摘要
为解决板式橡胶支座连续梁桥在强震作用下可能发生支座滑动进而产生桥梁碰撞、甚至落梁的问题,基于ANSYS平台建立了某板式橡胶支座连续梁桥的有限元模型,进行地震反应时程分析,研究了地震动峰值加速度(PGA)与峰值速度(PGV)的比值(fg)对桥梁板式橡胶支座滑动效应的影响,并给出了相对不利地震动输入方式.在相对不利地震动输入下,引入拉索减震支座进行减震研究,并对该支座的拉索刚度和初始间隙进行参数敏感性分析.结果表明,fg在一定程度上能够表征地震动频谱特性,板式橡胶支座的滑动能力与支座位移随fg的减小而增大;在相对不利的fg较小的地震作用下,拉索减震支座具有良好的限位能力,合理设置拉索刚度和初始间隙能有效防止桥梁碰撞、落梁等灾害.
To solve the problem that bridge collision or girder falling might be caused by the bearing sliding of bridges with laminated rubber bearings under strong earthquake,a finite model of a continuous bridge isolated by laminated rubber bearings was established by ANSYS. Based on the time-history analysis,the influence of the ratio of the peak ground acceleration（ PGA） to the peak ground velocity（ PGV）,fg,on the sliding response of the laminated rubber bearings was discussed and the relatively unfavorable ground motion input mode was concluded. With the input of the relatively unfavorable ground motion,the cable sliding friction aseismic bearings were introduced to absorb shock,and the parameter sensitivity analysis of the cable stiffness and the initial gap was carried out.The results showthat fgcan characterize the frequency characteristics of the ground motion to some extent. The sliding capacity of the plate rubber bearing and the bearing displacement increase as fg decreases. Under the relatively unfavorable ground motion with small fg,the cable sliding friction aseismic bearings have great capacity of displacement restriction,and reasonable setting of the cable stiffness and the initial gap can effectively prevent disasters such as bridge collision and beam falling.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第5期1006-1012,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51278104
51578151)
关键词
板式橡胶支座
滑动效应
地震动特性
拉索减震支座
laminated rubber bearings
sliding effect
ground motion characteristics
cable sliding friction aseismic bearings
